Quad Variable Relay for Protection of AC Microgrids | Chapter 01 | Advances in Applied Science and Technology Vol. 6
The two major technical challenges
facing widespread deployment of microgrids are the impacts of microsources and
active loads on control instruments and protective devices. Classical
protective devices operate through detection and response. Detection is performed
by measuring parameters of the system and comparing with set values. Response
is performed through isolation of faulted segment if the result of comparison
dictates isolation. These classical protective devices as well as modified
classical devices reported in literature malfunction under complex operating
conditions of microgrids that have multiple controls regimes and are capable of
grid interconnection and islanding. In this book chapter, a quad-variable
rule-based relay is described. The relay meets both plug-and-play and
peer-to-peer requirements of microgrids. The interaction of four critical
parameters of complex microgrids is modeled using fuzzy rule. Using the rules,
sub-controllers are designed for microsource and feeder in the distribution
system. Combinational logic components are used to realize the hardware of the
sub-controllers in SimPowerSystems. Reliability of the relay is established
through offline and online response tests. The relay marks a departure from
classical or modified classical protection wherein protection is based on a
defined short circuit capacity. In this work, protection is based on nominal
parameters of two members of the distribution system – microsources and
feeders.
Author(s) Details
Dr. Maruf A. Aminu
Department of Electrical and
Electronics Engineering, Nile University of Nigeria, Abuja, Nigeria.
Comments
Post a Comment